I have the same thing on SplunkCloud 7.2.9 this is how I can trigger it in chrome and safari (both without extensions enabled)
Starting with this dashboard xml:
<dashboard>
<label>testing_bloated_xml</label>
<row>
<panel>
<table>
<search>
<query>| makeresults 1
| eval thing1 = 1
| eval thing2 = 1</query>
<earliest>-15m</earliest>
<latest>now</latest>
</search>
<option name="count">10</option>
<option name="drilldown">none</option>
<option name="refresh.display">progressbar</option>
</table>
</panel>
</row>
</dashboard>
I just have to format the two columns quickly and then I end up with duplicated format tags for field "thing1".
This gets a lot worse with more columns as it exponentially blows out the dashboard xml until the dashboard starts lagging heavily.
Then I have to edit the xml to remove the duplicates which is pretty painful.
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